Parasite Prevention for Pets

Keeping Ontario Pets Safe From Parasites

Parasites like fleas, ticks, and heartworms pose a serious health risk to pets. At Highbury North Pet Hospital in London, Ontario, we help pet owners take proactive steps to keep their furry family members parasite-free all year round.

This blog from an East London, ON vet covers why parasite prevention for pets is so important. We also go over some of the seasonal patterns of pests in Ontario, and offer tips on how to protect your pet with vet-recommended products and strategies.

Why Are Parasites So Dangerous for Pets?

Parasites can cause skin irritation, allergic reactions, serious infections, and even fatal illnesses. Fleas often cause intense itching and can lead to infections. They can carry other parasites, such as tapeworms. Anemia is also a risk in severe infestations. Ticks are known carriers of several diseases, such as Lyme disease. Heartworms, which are transmitted through mosquito bites, affect the lungs and heart. Infestations can be fatal if untreated.

These parasites are more than a nuisance—they’re a major health threat. 

The good news is that most infestations and infections are preventable with regular, vet-approved medications and vigilant care. 

Understanding Ontario’s Seasonal Parasite Risks

In Ontario, flea and tick season typically begins in early spring and lasts until the first frost. Mosquito numbers—and with them, heartworm risk—also peak in the warmer summer months. However, due to milder winters in recent years, parasites can remain active longer than expected.

This extended activity means year-round parasite protection is now the recommended standard of care. Skipping even a single month of prevention can leave your pet vulnerable to infestation or disease. When it comes to flea and tick control, Ontario residents do sometimes choose to discontinue prevention during winter. However, we advise keeping pets on prevention all year long.

How Do Vets Prevent Parasites in Cats and Dogs?

At Highbury North Pet Hospital, we offer parasite prevention plans to protect your pet, and offer recommendations that are based on the pet’s lifestyle, environment, and species.

Heartworm prevention for dogs is critical, especially between June and November, when mosquitos are most active. Flea and tick control is recommended throughout the warmer months—and sometimes beyond. For cats, even indoor-only pets can be at risk, as fleas can enter homes on clothing or other animals.

Medications are available in chewable, topical, and injectable forms. Your vet will guide you on the safest and most effective options for your pet. Regular exams are also crucial in detecting parasites. 

Signs of Parasite Exposure or Infection

While prevention is ideal, it’s also important to recognize the signs of a possible infection. Pets may show symptoms such as scratching, visible pests, lethargy, coughing, unexplained weight loss, or vomiting. These can indicate the presence of external or internal parasites. 

Early detection through wellness exams and fecal testing helps prevent more serious complications.  If you notice any unusual symptoms, book an appointment right away. 

Do All Pets Need the Same Parasite Protocols?

Not necessarily. Parasite protection for cats is a bit different than that for dogs. Never use Fluffy’s products on Fido, or vice versa. Aside from that, your pet’s risk level depends on their age, health status, and exposure to outdoor environments. For instance, an active dog that hikes in wooded areas may need more comprehensive tick protection than a senior dog that rarely leaves the backyard.

Similarly, indoor cats may still require some level of flea control, while outdoor cats are more prone to contact with multiple types of parasites. Each protocol is tailored individually to ensure both safety and effectiveness. For flea and tick control, Ontario residents can get specific recommendations from our North London, ON pet clinic.

Are Over-the-Counter Products as Effective?

Many over-the-counter flea and tick products are not as effective—or as safe—as vet-recommended brands. Some contain outdated ingredients, or they may not be properly dosed for your pet’s weight. In some cases, they can cause adverse reactions. 

We recommend choosing products based on veterinary guidance to ensure full-spectrum protection. You can read more about effective parasite control options here.

Can Humans Catch Parasites from Pets?

Yes—certain parasites are zoonotic, meaning they can transfer from animals to humans. These include fleas, ticks, and some worms. Children, seniors, and immunocompromised individuals are particularly vulnerable.

Maintaining a consistent parasite prevention routine for your pet can also protect your household. Learn more about zoonotic diseases which are carried by parasites (External link 2) and how they can impact human health.

Protect Your Pet and Your Family with Preventative Care

Parasite prevention for pets is not just a seasonal task—it’s a year-round commitment that keeps your companion healthy and protects your household from risk. Visit our Service Page to learn more about the services we offer and the type of pets we see.

Visit Our North London, ON Pet Hospital

Do you want to learn more about heartworm prevention for dogs or parasite protection for cats? At Highbury North Pet Hospital in London, Ontario, we provide personalized parasite prevention plans tailored to your pet’s specific lifestyle and risk factors. Call us today to schedule an appointment and stay ahead of parasite threats.

This blog is meant to be informational only. Always consult with your veterinarian for the right medical advice or treatment plan to fit your pet’s needs.